Learn Linux, and take your career to the next level! Linux Essentials, 2nd Edition provides a solid foundation of knowledge for anyone considering a career in information technology, for anyone new to the Linux operating system, and for anyone who is preparing to sit for the Linux Essentials Exam. Through this engaging resource, you can access key information in a learning-by-doing style. Hands-on tutorials and end-of-chapter exercises and review questions lead you in both learning and applying new information—information that will help you achieve your goals! With the experience provided in this compelling reference, you can sit down for the Linux Essentials Exam with confidence. An open source operating system, Linux is a UNIX-based platform that is freely updated by developers. The nature of its development means that Linux is a low-cost and secure alternative to other operating systems, and is used in many different IT environments. Passing the Linux Essentials Exam prepares you to apply your knowledge regarding this operating system within the workforce. Access lessons that are organized by task, allowing you to quickly identify the topics you are looking for and navigate the comprehensive information presented by the book Discover the basics of the Linux operating system, including distributions, types of open source applications, freeware, licensing, operations, navigation, and more Explore command functions, including navigating the command line, turning commands into scripts, and more Identify and create user types, users, and groups Linux Essentials, 2nd Edition is a critical resource for anyone starting a career in IT or anyone new to the Linux operating system.
Introduction xi Chapter 1 Selecting an Operating System 1 What Is an OS? 1 Investigating User Interfaces 4 Where Does Linux Fit in the OS World? 8 What Is a Distribution? 13 Chapter 2 Understanding Software Licensing 21 Investigating Software Licenses 21 Looking at the Free Software Foundation 24 Looking at the Open Source Initiative 26 Looking at the Creative Commons 29 Using Open Source Licenses 30 Chapter 3 Investigating Linux’s Principles and Philosophy 35 Exploring Linux through the Ages 35 Using Open Source Software 38 Understanding OS Roles 41 Chapter 4 Using Common Linux Programs 47 Using a Linux Desktop Environment 47 Working with Productivity Software 55 Using Server Programs 62 Managing Programming Languages 68 Handling Software Packages 71 Chapter 5 Managing Hardware 75 Learning about Your CPU 75 Identifying Motherboard Capabilities 78 Sizing Your Power Supply 80 Understanding Disk Issues 81 Managing Displays 89 Handling USB Devices 93 Managing Drivers 94 Chapter 6 Getting to Know the Command Line 99 Starting a Command Line 99 Running Programs 104 Using Shell Features 107 Getting Help Using man Pages 110 Getting Help Using info Pages 117 Finding Additional Documentation 120 Chapter 7 Managing Files 127Understanding Where Things Go 127 Navigating Files and Directories 133 Manipulating Files 137 Manipulating Directories 145 Chapter 8 Searching, Extracting, and Archiving Data 151 Using Regular Expressions 151 Searching for and Extracting Data 153 Redirecting Input and Output 161 Archiving Data 166 Chapter 9 Exploring Processes and Process Data 175 Understanding Package Management 175 Understanding the Process Hierarchy 181 Identifying Running Processes 182 Using Log Files 187 Chapter 10 Editing Files 193 Understanding the Role of Text Files 193 Choosing an Editor 195 Launching an Editor 196 Editing Files with pico or nano 198 Editing Files with vi 202 Chapter 11 Creating Scripts 211 Beginning a Shell Script 212 Using Commands 212 Using Arguments 215 Using Variables 216 Using Conditional Expressions 219 Using Loops 220 Using Functions 221 Setting the Script’s Exit Value 223 Chapter 12 Understanding Basic Security 227 Understanding Accounts 227 Using Account Tools 234 Working as root 237 Chapter 13 Creating Users and Groups 245 Creating New Accounts 245 Modifying Accounts 253 Deleting Accounts 259 Managing Groups 262 Chapter 14 Setting Ownership and Permissions 267 Setting Ownership 267 Setting Permissions 271 Using Special Permission Bits and File Features 278 Chapter 15 Managing Network Connections 285 Understanding Network Features 285 Configuring a Network Connection 287 Testing Your Network Connection 299 Protecting Your System from the Bad Guys 303 Appendix A Answers to Review Questions 307 Appendix B LPI ’s Certification Program 327 Index 331
About the Authors Christine Bresnahan has worked in the IT industry for more than 30 years and is currently an adjunct professor of Python programming and Linux system administration classes at Ivy Tech Community College in Indianapolis. She is coauthor of Linux Bible, 8th Edition, and Linux Command Line and Shell Scripting Bible. Richard Blum has more than 25 years as a network and systems administrator, currently managing Microsoft, Unix, Linux, and Novell servers for a network with more than 3,500 users. He has developed online programming and Linux courses that he teaches to students worldwide.
Learn Linux Quickly and Easily Mastering the Linux operating system will help you advance your IT career. This straightforward guide will help you master the fundamentals of Linux and help prepare you for the Linux Essentials Exam. Beginning with operating system basics, Linux Essentials, 2nd Edition explains Linux properties and principles and shows you how to manage this open source operating system in the workplace. Lessons are organized by task, and each chapter features exercises and review questions to solidify your knowledge. Learn these Linux essentials—and more: Types of distributions and open source applications All about freeware, licensing, operations, and navigation Using common Linux programs Navigating the command line Searching, extracting, and archiving data Turning commands into scripts Creating user types, users, and groups Managing network connections This Essentials book features: Chapter-opening learning objectives Full coverage of all exam objectives Screenshots and illustrations reinforce learning Essentials and Beyond—summaries and additional suggested exercises
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